stasis_recording/stored: remove calls to deprecated readdir_r function.

The readdir_r function has been deprecated and should no longer be used. This
patch removes the readdir_r dependency (replaced it with readdir) and also moves
the directory search code to a more centralized spot (file.c)

Also removed a strict dependency on the dirent structure's d_type field as it
is not portable. The code now checks to see if the value is available. If so,
it tries to use it, but defaults back to using the stats function if necessary.

Lastly, for most implementations of readdir it *should* be thread-safe to make
concurrent calls to it as long as different directory streams are specified.
glibc falls into this category. However, since it is possible that there exist
some implementations that are not safe, locking has been added for those other
than glibc.

ASTERISK-26412
ASTERISK-26509 #close

Change-Id: Id8f54689b1e2873e82a09d0d0d2faf41964e80ba

1 files changed, 28 insertions, 0 deletions

diff --git a/include/asterisk/file.h b/include/asterisk/file.h
index c71866ead..01e5797f5 100644
--- a/include/asterisk/file.h
+++ b/include/asterisk/file.h
@@ -138,6 +138,34 @@ int ast_filedelete(const char *filename, const char *fmt);
 int ast_filecopy(const char *oldname, const char *newname, const char *fmt);
 
 /*!
+ * \brief Callback called for each file found when reading directories
+ * \param dir_name the name of the directory
+ * \param filename the name of the file
+ * \param obj user data object
+ * \return non-zero to stop reading, otherwise zero to continue
+ */
+typedef int (*ast_file_on_file)(const char *dir_name, const char *filename, void *obj);
+
+/*!
+ * \brief Recursively iterate through files and directories up to max_depth
+ * \param dir_name the name of the directory to search
+ * \param on_file callback called on each file
+ * \param obj user data object
+ * \param max_depth re-curse into sub-directories up to a given maximum (-1 = infinite)
+ * \return -1 or errno on failure, otherwise 0
+ */
+int ast_file_read_dirs(const char *dir_name, ast_file_on_file on_file, void *obj, int max_depth);
+
+/*!
+ * \brief Iterate over each file in a given directory
+ * \param dir_name the name of the directory to search
+ * \param on_file callback called on each file
+ * \param obj user data object
+ * \return -1 or errno on failure, otherwise 0
+ */
+#define ast_file_read_dir(dir_name, on_file, obj) ast_file_read_dirs(dir_name, on_file, obj, 1)
+
+/*!
  * \brief Waits for a stream to stop or digit to be pressed
  * \param c channel to waitstream on
  * \param breakon string of DTMF digits to break upon